Results 41 to 50 of about 34,012 (161)
Gravitational lensing in a plasma from worldlines [PDF]
Physical Review DWe study the deflection of light rays in a cold, nonmagnetized plasma using the worldline framework. Starting from Synge’s Hamiltonian formalism, we construct a position-space action and use it perturbatively to calculate light bending angles.
F. Comberiati, Leonardo de la Cruz
semanticscholar +1 more source
Precision Weak Gravitational Lensing Using Velocity Fields: Fisher Matrix Analysis [PDF]
Astrophysical Journal, 2019 Weak gravitational lensing measurements based on photometry are limited by shape noise: the variance in the unknown unlensed orientations of the source galaxies.
D. Wittman, M. Self
semanticscholar +1 more source
Testing General Relativity with Current Cosmological Data [PDF]
, 2010 Deviations from general relativity, such as could be responsible for the cosmic acceleration, would influence the growth of large scale structure and the deflection of light by that structure.
Alexie Leauthaud +8 more
core +2 more sources
Roulettes: a weak lensing formalism for strong lensing: I. Overview [PDF]
, 2016 We present a new perspective on gravitational lensing. We describe a new extension of the weak lensing formalism capable of describing strongly lensed images.
C. Clarkson
semanticscholar +1 more source
Influence of the local Universe on weak gravitational lensing surveys [PDF]
Monthly notices of the Royal Astronomical Society, 2018 Observations of the large-scale structure (LSS) implicitly assume an ideal Friedmann-Lemaitre-Robertson-Walker (FLRW) observer with the ambient structure having no influence on the observer.
R. Reischke +4 more
semanticscholar +1 more source
GRAVITATIONAL LENSING EFFECT ON COSMIC MICROWAVE BACKGROUND ANISOTROPIES: A POWER SPECTRUM APPROACH [PDF]
, 1995 The effect of gravitational lensing on cosmic microwave background (CMB) anisotropies is investigated using the power spectrum approach. The lensing effect can be calculated in any cosmological model by specifying the evolution of gravitational potential.
Seljak, Uros
core +2 more sources
Image simulations for gravitational lensing withskylens [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We present the latest version of the ray-tracing simulation code SKYLENS, which can be used to develop image simulations that reproduce strong lensing observations by any mass distribution with a high level of realism.
A. Plazas +5 more
semanticscholar +1 more source
3D Weak Gravitational Lensing of the CMB and Galaxies [PDF]
, 2015 In this paper we present a power spectrum formalism that combines the full three-dimensional information from the galaxy ellipticity field, with information from the cosmic microwave background (CMB).
Das, S., Heavens, A. F., Kitching, T. D.
core +1 more source
Shadows and photon spheres in static and rotating traversable wormholes
Nuclear Physics BWe explore the shadows and photon orbits of both static and rotating traversable wormholes by employing a redshift function in combination with two distinct shape functions.
Takol Tangphati +3 more
doaj +1 more source
An Exact Universal Gravitational Lensing Equation
, 1998 We first define what we mean by gravitational lensing equations in a general space-time. A set of exact relations are then derived that can be used as the gravitational lens equations in all physical situations.
A. Einstein +10 more
core +2 more sources